Recovery of chromium(III) ions from aqueous solution by carboxylate functionalized wood fibres / Yin Zhonglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 101-106 Titre : Recovery of chromium(III) ions from aqueous solution by carboxylate functionalized wood fibres Type de document : texte imprimé Auteurs : Yin Zhonglong, Auteur ; Chen Baihua, Auteur ; Chen Min, Auteur ; Hu Sheng, Auteur ; Cheng Haiming, Auteur Année de publication : 2015 Article en page(s) : p. 101-106 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Adsorption Carboxylate Chrome trivalent Eaux usées -- Recyclage Greffage (chimie) Laine Récupération (Déchets, etc.) Solutions aqueuses (chimie) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The application of wool fibres for recovery of heavy metal ions is equivalent to the use of one waste to clean-up of another. A carboxylate functionalized wool fibre (PAA-g-Wool) was prepared by grafting poly(acrylic acid) onto the surface of wool fibre in the presence of potassium permanganate and oxalic acid as a redox initiator system. The graft percentage was 80.2%. The PAA-g-Wool adsorbent was applied to absorb chromium(III) from aqueous solutions in a batchwise manner. The optimum pH for recovery of chromium(III) by PAA-g-Wool was found to be 6.0. Kinetic studies show that the sorption process agrees with the pseudo-second-order kinetic model, with the correlation coefficient (R2) more than 0.99. The adsorption equilibrium of chromium(III) was well defined by the Langmuir isotherm equation, and the adsorption capacity was found to be 95.78mg/g calculated by the Langmuir isotherm equation. After recycling for 5 times, the adsorption capacity of PAA-g-Wool to chromium ions was still maintained at 90%. The PAA-g-Wool could recover 97.1% of chromium(III) ions in the tannery wastewater. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of PAA-g-wool fibres - FTIR analysis - SEM analysis - Batch adsorption experiments - Effect of initial pH - Effect of contact time - Effect of initial concentration of chromium (III) - Desorption and recycling experiments - Treatment of tannery wastewater - RESULTS AND DISCUSSION : Preparation and characterization of PAA-g-wool - Effect of pH - Adsorption kinetics - Adsorption isotherms - Recycling adsorption - Treatment of tannery wastewater En ligne : https://drive.google.com/file/d/14Bf5R3-VSJ7uyRn6R4GbQBB8Zk8r-r-s/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24252 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
17271	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The treatment of collagen fibre and cattle hide with transglutaminase in supercritical carbon dioxide / Cheng Haiming in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 5 (09-10/2014) . - p. 216-221 Titre : The treatment of collagen fibre and cattle hide with transglutaminase in supercritical carbon dioxide Type de document : texte imprimé Auteurs : Cheng Haiming, Auteur ; Wu Lian, Auteur ; Yin Zhonglong, Auteur ; Chen Min, Auteur ; Li Zhiqiang, Auteur Année de publication : 2014 Article en page(s) : p. 216-221 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux de bovins Fluides supercritiques Réticulants Température de retrait Transglutaminase Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It was reported that supercritical fluids could increase the reaction rates and stability of enzymes. The transglutaminase (TGase) was used as a cross-linking agent for collagen fibre and cattle hide in supercritical carbon dioxide (SCF-CO2) medium. The denaturation temperature (Td) and shrinkage temperature (Ts) of the cross-linked samples were determinated. SCF-CO2 could improve the cross-linking reaction of the TGase with the collagen fibre and cattle hide according to the denaturation temperature determination. For collagen fibre, the Td of TG-SCF-Collagen is about 20°C higher than that of TG-Collagen in water medium. While the Td of cattle hide treated with TGase in SCF-CO2 is about 10°C higher than that of in water medium. Interestingly, the shrinkage temperature of the cattle hide did not show any change while it was treated by TGase both in SCF-CO2 medium and in water. However, the appearence of the hide after TGase treatment was tighter and finer with the area reduction. The results implied that intermolecular cross-linking created by TGase did not like the cross-linking by chrome (III)tanning agents, which formed rigid structures among the collagen fibrils that play the main role for the increase of shrinkage temperature of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Collagen fibre treated with TGase in SCF-CO2 - Cattle hide treated by TGase in SCF-CO2 - Differential Scanning Calorimetry (DSC) - Determination of the shrinkage temperature - Appearance - Physical properties determination - RESULTS AND DISCUSSION : Collagen fibre treated by TGase in SCF-CO2 - Cattle hide treated with TGase in SCF-CO2 En ligne : https://drive.google.com/file/d/1_LvTHftpV-xR6GWNHBdkPlVwSLotld8u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22273 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16629	-	Périodique	Bibliothèque principale	Documentaires	Disponible
16621	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)